Hole serves various purposes in any machine element. These holes may be round, square, rectangular or any other shape depending on the requirement. For round holes, the machines are available in the market. But for square or any other type of holes, the Methods presently used are broaching, electrode-discharge machine (E.D.M.), electro-chemical machine. These are very expensive and require special tools or machines.
Design and Fabrication of Square Hole Drill Machine
Heer, GS. "Design and Fabrication of Square Hole Drill Machine." Proceedings of the ASME 2007 2nd Frontiers in Biomedical Devices Conference. ASME 2007 2nd Frontiers in Biomedical Devices. Irvine, California, USA. June 7–8, 2007. pp. 91-96. ASME. https://doi.org/10.1115/BioMed2007-38015
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